SAN FRANCISCO (Reuters) - Climate scientists said on
Tuesday they have begun using information from a tropical
phenomenon that may give them a one to three-week jump on
hurricanes, cyclones, monsoons and other weather patterns.

Traditional weather forecasts normally range from single
hours up to five days ahead. But scientists at an American
Geophysical Union conference in San Francisco said that they
may be able to use data from the tropical weather pattern known
as the Madden-Julian Oscillation, or MJO, to improve their
understanding of looming weather developments.

Discovered in 1971 by Roland Madden and Paul Julian, the
Madden-Julian Oscillation is a large, slowly evolving weather
event originating in the tropics that affects weather globally.

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MJOs happen about two to six times a year over a 40-to-50
day cycle that includes periods of high and low precipitation.

MJO data has revealed their direct influence upon
mid-latitude weather, summer monsoons, hurricane development as
well as El Nino and La Nina weather events.

The data help accurately forecast the onset of and breaks
in monsoons in Southeast Asia, which have economic
consequences.

"We believe this data has important implications in regards
to MJO effects on agriculture production," said Duane Waliser
of the NASA Jet Propulsion Laboratory and the US CLIVAR, a
climate science consortium.

Waliser said MJOs move in an eastward direction across the
planet and directly influence weather downstream from them,
including hurricane development in the Atlantic Ocean.

With lead times of one to three weeks, MJO data better
prepare scientists to determine if hurricanes may develop.

Recent efforts by US CLIVAR have established a new MJO
forecast gauge that is being adopted by forecast centers.

"We now have a unified metric to describe the evolution of
an MJO event that can be adapted by a number of weather
forecasting centers globally" Waliser said.